From c58c0dc40c1288b5fd5d9e06667e40afd6465a1d Mon Sep 17 00:00:00 2001
From: aliaspider
Date: Mon, 9 Nov 2015 21:47:09 +0100
Subject: (3ds) fix build. add a frameskip build option for testing.

---
 libretro/libretro.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/libretro/libretro.c b/libretro/libretro.c
index b7aa69b..930053b 100644
--- a/libretro/libretro.c
+++ b/libretro/libretro.c
@@ -26,8 +26,8 @@
 #include "../src/os9x_asm_cpu.h"
 
 #ifdef _3DS
-extern "C" void* linearMemAlign(size_t size, size_t alignment);
-extern "C" void linearFree(void* mem);
+void* linearMemAlign(size_t size, size_t alignment);
+void linearFree(void* mem);
 #endif
 
 #define MAP_BUTTON(id, name) S9xMapButton((id), S9xGetCommandT((name)), false)
@@ -391,14 +391,26 @@ static void report_buttons (void)
 	}
 }
 
+//#define FRAME_SKIP
+
 void retro_run (void)
 {
+#ifdef FRAME_SKIP
+   IPPU.RenderThisFrame = !IPPU.RenderThisFrame;
+#else
    IPPU.RenderThisFrame = TRUE;
+#endif
+
    S9xMainLoop();
 //   asm_S9xMainLoop();
    S9xMixSamples(audio_buf, avail);
    audio_batch_cb((int16_t *) audio_buf, avail >> 1);
 
+#ifdef FRAME_SKIP
+   if(!IPPU.RenderThisFrame)
+      video_cb(NULL, IPPU.RenderedScreenWidth, IPPU.RenderedScreenHeight, GFX_PITCH);
+#endif
+
    poll_cb();
 
    report_buttons();
-- 
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